WA and EIS Issue

I have web analysis dashboard.
It has a button (navigation Dimension) where the client can choose one or more members.
That's my problem!

In some cases client choose 2 members, and we have data in cube and drill-through just for one of these members.

Then we receive a grid with information of just one member, but client doesnt know that.
Its not explicit!
the report enable the drill, but whe the client click on the cell to get drrill, nothing happing!
The report drill options dont appear!

If I put just one member, the member that have data, everything is fine.